import java.io.IOException;
import java.net.*;
import java.util.Scanner;

public class UdpEchoClient {
    private DatagramSocket socket = null;
    private String serverIp;
    private int serverSort;

    public UdpEchoClient(String serverIp, int serverSort) throws SocketException {
        this.serverIp = serverIp;
        this.serverSort = serverSort;
        socket = new DatagramSocket();
    }
    private void start() throws IOException {
        System.out.println("客户端启动");
        Scanner scanner = new Scanner(System.in);
        while (true){
            System.out.println("请输入内容");
            if(!scanner.hasNext()){
                break;
            }
            String request = scanner.next();
            DatagramPacket requestPacket = new DatagramPacket(request.getBytes(),request.getBytes().length,
                    InetAddress.getByName(serverIp),serverSort);
            socket.send(requestPacket);
            DatagramPacket responsePacket = new DatagramPacket(new byte[4096],4096);
            socket.receive(responsePacket);
            String response = new String(responsePacket.getData(),0, responsePacket.getLength());
            System.out.println(response);
        }
    }

    public static void main(String[] args) throws IOException {
        UdpEchoClient client = new UdpEchoClient("127.0.0.1",9090);
        client.start();
    }
}
